Nintendo Power is going to have a massive preview for Pokemon Conquest which should reveal English names for various things, though a sneak preview has revealed some English names for some of the nations:
Japanese - English
Hajime Nation - Aurora
Flame Nation - Ignis
Plant Nation - Greenleaf
Spring Nation - Fontaine
Tram Nation - Violight
Now I understand Ignis, Greenleaf (should have named Flame Nation "Redfire" ), and Fountaine, but Aurora and Violight? Aurora is usually related to Ice and I'm guessing Violight is a pun of "violet" and "light" but it's not violet (unless they're talking about ultraviolet).
Serebii says they'll post more soon and when they do I'll post them here (and maybe even talk about the Nations as I've promised to do.